论文标题
潜在的GW190521电磁对应物ZTF19ABANRHR的标准警笛宇宙学测量
A Standard Siren Cosmological Measurement from the Potential GW190521 Electromagnetic Counterpart ZTF19abanrhr
论文作者
论文摘要
电磁对应物ZTF19ABANRHR与二进制黑洞合并GW190521的鉴定为从该标准的警笛中推断出具有独特的宿主星系的可能性。遥远的合并允许超越哈勃常数的宇宙论点。在这里，我们表明，根据电磁数据计算得出的ZTF19ABANRHR的三维空间位置与Ligo-Virgo协作提供的GW190521的更新天空定位保持一致。如果ZTF19ABANRHR与GW190521合并相关联并假定WCDM型号，我们发现$ H_0 = 48^{+24} _ { - 10} $ km/s/s/mpc，$ km/s/mpc，$ω_m= 0.39^ -1.29^{+0.63} _ { - 0.50} $（中值和68％可靠间隔）。如果我们使用从另一个重力波事件中推断出的Hubble常数值，GW170817作为我们的分析的先验，以及假设flat $λ$ CDM以及对Planck的物理物质密度$ω_m$ $ from Planck的模型的约束，我们发现$ H_0 = 69.1 = 69.1 = 69.1^{8.7} {8.7} = {8.7} $ 6.0} $ 6.0} $ km 6.0} $ km 6.0} $ 6.0}。
The identification of the electromagnetic counterpart candidate ZTF19abanrhr to the binary black hole merger GW190521 opens the possibility to infer cosmological parameters from this standard siren with a uniquely identified host galaxy. The distant merger allows for cosmological inference beyond the Hubble constant. Here we show that the three-dimensional spatial location of ZTF19abanrhr calculated from the electromagnetic data remains consistent with the updated sky localization of GW190521 provided by the LIGO-Virgo Collaboration. If ZTF19abanrhr is associated with the GW190521 merger and assuming a flat wCDM model we find that $H_0 =48^{+24}_{-10}$ km/s/Mpc, $Ω_m =0.39^{+0.38}_{-0.29}$, and $w_0 = -1.29^{+0.63}_{-0.50}$ (median and 68% credible interval). If we use the Hubble constant value inferred from another gravitational-wave event, GW170817, as a prior for our analysis, together with assumption of a flat $Λ$CDM and the model-independent constraint on the physical matter density $ω_m$ from Planck, we find $H_0 = 69.1^{8.7}_{-6.0}$ km/s/Mpc.
